Antarctic Ground-based Observations During Selected THEMIS Satellite Event Studies

Details Antarctic Ground-based Observations During Selected THEMIS Satellite Event Studies Antarctic Ground-based Observations During Selected THEMIS Satellite Event Studies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm11a0330w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM11A-0330

Other

7845 Particle Acceleration, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

In Antarctica, the Polar Experiment Network for Geospace Upper-atmosphere Investigations (PENGUIn) team operates a suite of optical and radio wave imagers, magnetometers, riometers, and ELF-HF receivers at South Pole and McMurdo stations, as well as from the Automated Geophysical Observatories (AGOs) on the Antarctic polar plateau. These stations span locations from the auroral zone to deep in the polar cap. Employing data from this array, ground-based observations during several THEMIS satellite event studies will be discussed. These include: a flux transfer event (FTE) on May 20, 2007; a solar wind shock propagation on June 21; a hot flow anomaly on July 4; high latitude optical events on August 8th and 10th; and substorm events on March 23rd and 24th. Of particular interest is the FTE event where the magnetometer Z-component appears to have the signature of a line current passing overhead at South Pole and a sharp cutoff of 2-4 kHz VLF signals is also observed at the time the current moved overhead. Cosmic noise absorption and 630 nm optical signals also began about the time the currents moved overhead, and then tracked the H-component of the magnetometer. The enhanced optical signal was coincident with increased ionosphere currents as shown by the H-component. In this presentation, a southern hemisphere contextual description of this event, and the others listed above, will be presented.

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